/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.bpmn.parser;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.activiti.bpmn.model.BaseElement;
import org.activiti.bpmn.model.DataObject;
import org.activiti.bpmn.model.FlowElement;
import org.activiti.engine.parse.BpmnParseHandler;
import org.slf4j.Logger;

/**
 */
public class BpmnParseHandlers {

	private static final Logger LOGGER = org.slf4j.LoggerFactory.getLogger(BpmnParseHandlers.class);

	protected Map<Class<? extends BaseElement>, List<BpmnParseHandler>> parseHandlers;

	public BpmnParseHandlers() {
		this.parseHandlers = new HashMap<Class<? extends BaseElement>, List<BpmnParseHandler>>();
	}

	public List<BpmnParseHandler> getHandlersFor(Class<? extends BaseElement> clazz) {
		return parseHandlers.get(clazz);
	}

	public void addHandlers(List<BpmnParseHandler> bpmnParseHandlers) {
		for (BpmnParseHandler bpmnParseHandler : bpmnParseHandlers) {
			addHandler(bpmnParseHandler);
		}
	}

	public void addHandler(BpmnParseHandler bpmnParseHandler) {
		for (Class<? extends BaseElement> type : bpmnParseHandler.getHandledTypes()) {
			List<BpmnParseHandler> handlers = parseHandlers.get(type);
			if (handlers == null) {
				handlers = new ArrayList<BpmnParseHandler>();
				parseHandlers.put(type, handlers);
			}
			handlers.add(bpmnParseHandler);
		}
	}

	public void parseElement(BpmnParse bpmnParse, BaseElement element) {

		if (element instanceof DataObject) {
			// ignore DataObject elements because they are processed on Process
			// and Sub process level
			return;
		}

		if (element instanceof FlowElement) {
			bpmnParse.setCurrentFlowElement((FlowElement) element);
		}

		// Execute parse handlers
		List<BpmnParseHandler> handlers = parseHandlers.get(element.getClass());

		if (handlers == null) {
			LOGGER.warn("Could not find matching parse handler for + " + element.getId() + " this is likely a bug.");
		} else {
			for (BpmnParseHandler handler : handlers) {
				handler.parse(bpmnParse, element);
			}
		}
	}

}
